Select the "Enter Secrets" option at the main menu, then enter "ELBO" as a code.

Extra legal pads

Select the "Enter Secrets" option at the main menu, then enter "CLIPP" as a code.

Utonium Chateau level

Select the "Enter Secrets" option at the main menu, then enter "GOGETBUTCH" as a code.

Townsville Skies level

Select the "Enter Secrets" option at the main menu, then enter "BEATBRICK" as a code.

Buttercup graphics

Select the "Enter Secrets" option at the main menu, then enter "LUMPKINS" as a code.

Blossom graphics

Select the "Enter Secrets" option at the main menu, then enter "MISSKEANE" as a code.

Mayor graphics

Select the "Enter Secrets" option at the main menu, then enter "MCCRACKEN" as a code.

Art Museum trading card

Select the "Enter Secrets" option at the main menu, then enter "MALPHS" as a code.

Boogie Man trading card

Select the "Enter Secrets" option at the main menu, then enter "HOTLINE" as a code.

Boomer trading card

Select the "Enter Secrets" option at the main menu, then enter "ICEBREATH" as a code.

Evil Cat trading card

Select the "Enter Secrets" option at the main menu, then enter "POWERPUFF" as a code.

Rainbow The Clown trading card

Select the "Enter Secrets" option at the main menu, then enter "MRSBELLUM" as a code.

Talking Dog trading card

Select the "Enter Secrets" option at the main menu, then enter "RUFFBOYS" or "BIGBILLY" as a code.

Townsville trading card

Select the "Enter Secrets" option at the main menu, then enter "TOYSPOWER" or "TALKINGDOG" as a code.

Townsville City Hall trading card

Select the "Enter Secrets" option at the main menu, then enter "PRINCESS" as a code.

Townsville Dump level

Play the Utonium Chateau level, defeat Butch, then go to the hearts which let you know you have completed the level. Once that is done, go to the play option and press Left. The Townsville Dump level will be now be available. On this stage, you will fight Boomer.

Game Shark Codes

Note: You must have a 2.1 or higher version of the Game Shark to use these codes in a Game Boy Color system.